Question
Prove that the following arguments are standard by constructing metaphorical proof
$\sim (A \ \&\ B) \rightarrow H$
$F\ v \sim (H \ \&\ F)$
$(A \ \&\ B) \rightarrow (H \ \&\ F)$
$\sim F \ \&\ (D \ \&\ E)$
$(D \ \&\ E) \ \&\ H$

Answer

$(1)\ \sim (A \ \&\ B)\ \rightarrow H$ $P$
$(2)\ F\ v \sim (H \ \&\ F)$ $P$
$(3)\ (A \ \&\ B)\ \rightarrow (H \ \&\ F)$ $P$
$(4)\ \sim F \ \&\ (D \ \&\ E)$ $P/ (D \ \&\ E)\ \&\ H$
$(5)\ \sim F$ $4,$ Simp.
$(6)\ \sim (H \ \&\ F)$ $2, 5, DS$
$(7)\ \sim (A \ \&\ B)$ $3, 6, MT$
$(8)\ H$ $1, 7, MP$
$(9)\ D \ \&\ E$ $4,$ Simp.
$(10)\ (D \ \&\ E)\  \&\ H$ $9, 8,$ Conj.

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